Opening and closing coil control circuit of long stroke permanent magnet mechanism

Abstract

The invention discloses a breaking-closing coil control circuit of a long-stroke permanent magnetic mechanism. The breaking-closing coil control circuit solves the problems of great starting current, low breaking speed and great closing jumping and breaking rebounding of the existing permanent magnetic mechanism in a long stroke. A breaking-closing winding uses a multi-coil structure, so that the long-stroke movement of an iron core can be realized; the stroke requirements of an ultra-high-voltage or extra-high voltage circuit breaker can be met; according to speed feature requirements of the high-voltage circuit breaker in different stages of a moving process, different windings are respectively conducted; on one hand, the excitation current of a coil of the permanent magnetic mechanism, particularly the starting current is reduced, the starting electromagnetic force of the permanent magnetic mechanism is improved, and high acceleration is generated; on the other hand, the speed in a final breaking-closing stage is reduced through regulating winding current; the closing jumping and the breaking rebounding are reduced; the breaking-closing speed of a switch contact can be better controlled, so that a control system can be more easily realized, and the reliability is higher.

Description

technical field [0001] The invention relates to a high-voltage electrical switch, in particular to an opening and closing coil control circuit of a long-stroke bistable permanent magnet mechanism used in conjunction with an ultra-high voltage or extra-high voltage circuit breaker. Background technique [0002] With the improvement of the voltage level of the transmission line equipment, the required opening distance of the circuit breaker contacts increases, which makes the stroke of the moving iron core of the permanent magnet mechanism longer, which causes the opening and closing starting current of the permanent magnet mechanism to increase, resulting in a permanent magnet mechanism. The control is difficult, the energy consumption increases, the heat generation is serious, and the collision between the moving iron core and the static iron core is intensified. Since the initial opening speed and average opening speed obtained by the permanent magnet mechanism at the initi...

AI Technical Summary

Problems solved by technology

[0003] The invention provides an opening and closing coil control circuit of a long-stroke permanent magnet mechanism, which solves the problems of large starting current, low opening speed, large closing bounce and opening bounce of the existing permanent magnet mechanism under long stroke question

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